What is the difference btwn vulcanicity and volcanicity?

What is unusual about the iraq mountains ,in spite of their old age?

Explain the differences between convergent, divergent, and transform fault boundaries.

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves.b. when a river overflows it moves downhill resulting in the formation of caves.c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves.d. when water empties into lakes, sediment is deposited, resulting in formation of caves.